404 粗面乱流境界層の対数速度分布と変動速度確率密度関数型について(G05-8 乱流,G05 流体工学)  [in Japanese] 404 Log-law Profile in Rough Wall Boundary Layers And Its Relation to the Invariant Shape of PDF  [in Japanese]

The logarithmic velocity region is studied in zero-pressura-gradient turbulent boundary layers on the rough wall. We have already proposed the definition of log-law region in the case of smooth wall with using the probability density of velocity fluctuation. In this report this idea is expanded into the rough wall boundary layers, and extracted log-law region is discussed from the point of PDF profiles, and also its Reynolds number dependence is studied based on the experimental data.